code: def num_tracks(result_dict):
      return mt(result_dict) + pt(result_dict) + ml(result_dict)
  
file_path: gluon-cv/scripts/tracking/smot/helper.py
imports: import motmetrics
  import numpy
  import os
  import sys
label_desc: Use image node_id 11 for calling a global function with example usage: num_tracks(result_dict) and returns: unknown